Abstract:

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ZnO nanoparticles were carried out by Microemulsion method in the presence of
TritonX-100 (poly oxyethylene tert-octylphenyl ether) as a surfactant. X-100/n-hextnol/cyclohexane/
waterW/O microemulsion system was also determined. Zinc chloride (ZnCl2·2H2O) and ammonia
(NH3·H2O) were used as raw materials. The results indicated that the formation of ZnO nanoparticles
was confirmed, using X-ray diffractometer (XRD) and transmission electron microscopy (TEM). The
results showed that the nanoparticle was exactly ZnO with wurtzite type crystalline structure and the
size of nanoparticles is strongly affected by the ratio of water to surfactant(R). With the R value
increase, the particles size became larger.

Abstract: ZnO-SiO2 nanoparticles were synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles was controlled by manipulating the relative rates of the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) within the micro-emulsion. The average size of synthesized ZnO-SiO2 nanoparticles was in the range of 20-40 nm. The effects of synthesis parameters such as the molar ratio of water to precursor and the molar ratio of water to surfactant are discussed.

Abstract: Magnetic nanoparticles have attracted intensive attention for their wide applications as
biomaterials and magnetic storage materials. Polyurethane is one of the most biocompatible
polymers and has been used widely in vivo. In this paper, the magnetite nanoparticles were
synthesized by chemical precipitation under different conditions. The as-prepared samples were
characterized by X-ray diffraction and transmission electron microscopy, and their magnetic
properties were evaluated on a vibrating sample magnetometer. Then the magnetite nanoparticles
with different amounts were doped into polyurethane directly and composite films were made.
Reinforced by the inorganic particles, PU composite films were also characterized by Fourier
transform infrared spectra and mechanical tests., and the surface morphology of the composite film
was observed by Atomic Force Microscope The results showed the composite material was
reinforced by magnetic nanoparticles and also showed magnetic behavior. This kind of composite
materials have the potential to be used as hyperthermia treatment in biomedical field, like coatings
on cardiovascular stents.

Abstract: Nano-Fe3O4 magnetic particles were prepared by ultrasonic emulsion method and then were dispersed into water with chitosan or folate as surfactants for biocompatible water-based Fe3O4 magnetic fluid. The cubic inverse spinel structure of Fe3O4 nanoparticles were analyzed by X-ray diffraction technique (XRD). The saturation magnetizations of different magnetic particles were tested by a vibrating sample magnetometer (VSM). The morphologies of nanoparticles were observed by transmission electron microscope (TEM). The particle size was about uniform 10-20 nm, and their shape was approximately spherical. Meanwhile, dispersity was improved markedly after the surface modification. Comparing to magnetic fluid with chitosan modification, magnetic fluid was coated with chitosan and folate gets higher dispersity and stability when both of them have same saturation magnetizations.

Abstract: Silver nanoparticles (Ag NPs)/cellulose acetate (CA) composite ultrafine fibers were successfully prepared by the electrospinning method. Water-soluble Ag NPs were directly mixed into CA polymer fibers to form organic–inorganic composite ultrafine fibers. The optical property of Ag NPs was measured by ultraviolet-visble spectrometer (UV-vis). The presence and identification of crystalline of Ag NPs were confirmed by XRD analysis. Transmission electron microscopy (TEM) images showed that silver nanoparticles (Ag NPs) with an average diameter of 5–15 nm were obtained and were well distributed in the CA ultrafine fibers. The morphologies of the as-prepared electrospun Ag NPs/CA composite ultrafine fibers were characterized by scanning electron microscopy (SEM) and TEM. The composition of fibers was characterized by FTIR spectrometer.

Abstract: In the protecting inert gas, Fe nanoparticles were successfully prepared by confined arc plasma method. The particle size, microstructure and morphology of the particles by this process were characterized via X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption equation, transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED). The experiment results indicate that the samples by this process distributed uniform with spherical chain shapes, the crystal structure is body centered cubic (BCC) structure as same as the bulk materials, the particle size distribution ranging from 20 to 70 nm, with an average particle size about 39 nm obtained by TEM and confirmed by XRD and BET results. The specific surface area is 17.5 m2/g.